<!DOCTYPE html>
<!--
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<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <?php
        $score=52;
        if ($score>=90 and $score<=100)
            echo "优秀！";
        elseif ($score>=80 and $score<90)
            echo "良好！";
        elseif ($score>=70 and $score<80)
            echo "中等！";
        elseif ($score>=60 and $score<70)
            echo "及格！";
        else
            echo "不及格！";
        ?>
    </body>
</html>
